Hi. Eventually got it sorted today. Fault code P0380. Glow plug system error. So replaced with new NGK's & new relay. Total cost off the self of £55. Light has gone off and car is driving like it was when I bought it new. Amazing that glow plugs can be such a pain. Did not need the new throttle body so going to sell it.

Cheers for all your help & hope this is useful to someone in the future.